Improvement in bridge-walls for furnaces



l Vllhesaes.

s. c. STURTEVANT.

Bridge-Walls for Furnaces;

No. 144,421, Patent eti'fNovJLT873.

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UNITED STATES- PATENT OFFICE.

SETH O. STU'RTEVANT, OF CLEVELAND, OHIO.

IMPROVEMENT IN BRIDGE-WALLS FOR FURNACES.

Specification forming part of Letters Patent No. 144,421, dated November 11, 1873; application filed July 21, 1873.

o all whom it may concern:

Be it known that I, S. U. STURTEVANT, of

Cleveland, in the county of Guyahoga and View.

Like letters of reference refer to like parts in the several views.

The nature of this invention relates to a bridgewall or back for a furnace; and the object thereof is to provide for the consumption of smoke, gases, &c., arising from the burning fuel in the furnace, thereby economizing in the consumption of coal, and at the same time getting rid of the disagreeable annoyance of the thick volumes of smoke usually escaping from the furnace-stack. Of the above-said bridge-wall, the following is a description in detail:

In the drawings, A represents a triangular shaped shell or chamber, consisting of the sides B C, Fig. 4, closed at each end; whereas it is open at the bottom, and also at the top, the top opening being a long narrow one, as seen In the front side 0 of the shell is made a series of perforations, a, Fig. 2, which may be more or less in number. In

. front of said side, and resting upon the ledge E, is a plate, F, Fig. 4, which is prevented from being close against the side 0 by projections Gr, whereby is formed a space, H, between the front and the plate.

The application and operation of the abovedescribed bridge -wall are as follows: It is placed upon the bars of the grate close to the back end of the furnace, in the position shown in the drawings, the perforated side and the plate facing the door, the end of the flues of the furnace being in the rear of the bridge, and partially above it. In this position of the bridge-wall the flames, smoke, gases, &c., from the furnace, will have to pass over the'crown of the wall to the flues, at which point it meets and mingles with a volume of partially-heated air from the shell or chamber A, passing out therefrom through the opening D, thereby supplying the smoke, gas, 850., with the necessary oxygen to cause its combustion, and which is eii'ected in the most complete manner, as no black smoke is seen to issue from the stack.

The purpose of the plate F is to protect the side of the chamber from direct contact with the fuel and heat, and which is kept comparatively cool by the air passing from the chamber, through the perforations a, into the space H between the plate and chamber.

It will be obvious that the air finds its way into the chamber from the outside by passing under the grates and up through them, or that part of them on which the bridge-wall stands; hence there is a constant and uniform supply of fresh air into the chamber, and which is partially heated in its way thereto before mingling with the smoke.

What I claim as my invention, and desire to secure by Letters Patent, is-

The combination of the chamber or shell A having a perforated front wall, 0, opening D, and plate F, forming, in connection with the side 0, an air-space, H, in the manner as and for the purpose specified.

SETH O. STURTEVANT.

Witnesses:

W. F. BURRIDGE, A. F. CORNELL. 

